3 Answers
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Although Microsoft's license is still relevant, Google have created a "packaged apps" API which can let developers make offline apps. If you were able to get the SkypeKit service to install/run on Chrome OS, you could then make a JavaScript API to interface with it and we'd have ourselves a base to start developing a Chrome OS Skype client.

If anyone knows a good place to discuss all the finer details, please let me know.

I looked into using their SkypeKit API -- a newly released API for third-party developers to add Skype support to non-Skype hardware and software products. In its license agreement is a clause that explicitly states that you (developers) are not allowed to use their SkypeKit binaries in a web browser context.